I have got the top two planes n have bought the upgrade for both planes for the prop. for more power n that was two days ago n still have not gotten any upgrade for either at a cost of 167.500 each that's a lot of money in my case please help anyone onekill2 also I have a Windows phone I play on n my control's I can't get them to fly straight I have been in settings n went through them n still nothing I even uninstalled the game n still the same thing any help would be appreciated

Try lowerering the sensitivity bar in settings to around 75% and check whether it helps.

Secondly you can try flying with bombs and lowering the acceleration to about 80%.

Hope you will be able to fly straight.